台灣每天有3.8位孩童死於意外，但其中又以車禍佔大多數。台灣在2004年六月政府規定孩童在乘坐汽車時必須搭配兒童安全座椅，隨著孩童的體型發展，要選擇適合孩童的安全座椅，如何有效的乘坐安全座椅，正確的使用安全座椅可以減低七成車禍時造成的傷害，國內的汽車安全座椅推廣才剛起步，交通安全開始備受重視，對於嬰幼兒乘坐汽車安全性也被大眾所關心。
　　由於孩童的生物力學資料取得不易，本研究利用了另一種縮放方法將50%成年男性自願者的資料依照人體測量學將孩童頭頸部的尺寸和成人相比，求得頭頸部三種方向的幾何縮放係數。並使用基本的動態理論求得孩童的頭部軌跡、彎矩、加速度、時間的縮放比率。為了評估孩童的動態反應，使用多體動力來建立孩童的電腦模型。本研究使用了台灣地區六歲及十歲孩童模型，模擬得出的結果與孩童縮小後的頭部加速度相似生物力學資料，由此可看出這些模型都能符合生物真實性。
　　為了探討上述兩種孩童的電腦模型，以及在各式的兒童安全座椅的安全性，本研究將成人三點式安全帶、輔助椅墊、五點式安全座椅三種不同的設備下評估六歲孩童，利用成人三點式及輔助椅墊來比較十歲孩童。頭部傷害標準值以及頭胸部加速度，頭胸部的位移量討論在當孩童乘坐於不同的安全座椅的情況下，評估在哪種安全座椅較能真正保護孩童的安全。

　　In Taiwan, 3.8 children died of accidents everyday, and among the accidents, most of them are traffic accidents. In June of the 2004, Taiwan Government made the regulation that children should sit in child safety seat during their rides in cars. The domestic promotion of child safety seat has just started. The traffic safety of children and babies is becoming a more concerned issue. Suitable child safety seat should be selected according to the types of build of children at different ages. This article mainly focuses on the efficiency of child safety seat.
　　 Since the dynamic biomechanical data of children are not easy to obtain, the alternative method is applied to estimate the data based on 50% adult male volunteers by using scaled-down technique. Start with comparing the anthropometry between children and adult males so that the geometry scale factor in the three directions can be obtained. By using the basic dynamic theory and substituting the geometry scale factors, the dynamic responses for children such as trajectory, moment, acceleration, and time duration can be estimated. Based on the estimated responses for children, the computer child model can be developed by using multi-body dynamics. In this thesis, 6-year-old and 10-year-old children in Taiwan are chosen for modeling. The results from simulation show that acceleration of child head is similar to biomechanical estimation. Accordingly, the new child models fit in with the biofidelity.
　　Based on these two newly developed child computer models, the investigation for the safety of child seats can be conducted. Three conditions, including 3-pt adult belt, booster, and 5-pt belt safety seat are set to be evaluated for the 6-year-old model. For the 10-year-old model, 3-pt adult belt and booster are used for comparison. The Head Injury Criterion(HIC)values, acceleration of head and chest, and displacement of head and chest are observed to determine the possible injurys. The discussion between the different seat conditions is presented. Evaluations of children’s safety are made and points of attention are summed up according to the value of acceleration, displacement and HIC value.

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